Dual Immune Lineage Activation Underlies Systemic Immunopathology in Acute-on-Chronic Liver Failure

Area of Science:

• Hepatology
• Immunology
• Pathology

Background:

• Acute-on-chronic liver failure (ACLF) is a severe syndrome with high mortality, often involving multi-organ dysfunction.
• Immune dysregulation is key in ACLF, but the link to organ damage is unclear due to limited preclinical models.

Purpose of the Study:

• To develop and validate a novel preclinical model for ACLF that recapitulates its immune-driven organ damage.
• To investigate the immunological mechanisms underlying ACLF and multi-organ failure.

Main Methods:

• A combined carbon tetrachloride (CCl4)/acetaminophen (APAP)/lipopolysaccharide (LPS) mouse model (CALPS) was used.
• CALPS mice underwent comprehensive immunophenotyping and assessment of hepatic and extrahepatic organ injury.
• Immune cell infiltration in ACLF was compared to chronic liver disease (CLD), acute liver failure, and control groups.

Main Results:

• The CALPS model successfully replicated severe liver injury, fibrosis, systemic inflammation, and immune cell activation characteristic of ACLF.
• Significant infiltration of neutrophils, monocytes/macrophages, and T lymphocytes was observed in the liver and multiple organs (kidney, lung, heart).
• Renal dysfunction strongly correlated with immune cell infiltration, indicating a link between immune activation and multi-organ failure.

Conclusions:

• The CALPS model is a robust platform for studying immune-mediated organ injury in ACLF.
• This model facilitates research into the immunopathology of ACLF and the development of novel immunomodulatory therapies.